JP5315132B2 - Mounting structure of fuel injection valve - Google Patents

Description

  According to the present invention, a fuel injection portion at the front end of a fuel injection valve having a coupler at an axially intermediate portion is fitted in an attachment hole of the engine, and is fixed to the engine on the outer periphery of a fuel inlet portion at the rear end of the fuel injection valve. A fuel supply cap provided on the holding member and a positioning means for regulating the direction of the coupler in a fixed direction between the holding member and the fuel injection valve. .

  Such a fuel injection valve mounting structure is known, for example, as disclosed in Patent Document 1 below.

Japanese Utility Model Publication No. 60-173675

  In the fuel injection valve mounting structure disclosed in Patent Document 1, positioning means for restricting the direction of the coupler to a certain direction includes a pair of parallel flat surfaces formed on both side surfaces of the intermediate portion of the fuel injection valve, and these Since it is composed of a pair of sandwiching pieces formed on the fuel supply cap so as to come into contact with the flat surface, the sandwiching pieces project outward from the fuel supply cap to impair the appearance and increase the strength of the positioning means. It is necessary to form the sandwich pieces thickly, which causes problems such as an increase in size around the fuel supply cap.

  The present invention has been made in view of such circumstances, and a fuel injection valve provided with positioning means capable of firmly restricting the direction of a coupler in a certain direction without forming protrusions on the fuel injection valve and the fuel supply cap. It is an object to provide a mounting structure.

To achieve the above object, the present invention is to fitted a fuel injection portion of the front end of the fuel injection valve mounting hole of the engine, the outer periphery of the fuel inlet portion of the rear end of the fuel injection valve, secured to the engine A fuel supply cap provided on the holding member is fitted, and a coupler projecting to one side of the fuel injection valve is provided in the axial intermediate portion of the fuel injection valve, and the direction of the coupler is set in a certain direction. comprising setting only positioning means for regulating between the holding member and the fuel injection valve, the mounting structure of the fuel injection valve, the axially intermediate portion outer periphery of the fuel injection valve, the rear shoulder facing the fuel inlet side with the coupler and the synthetic resin of the cover is formed with integral, the rear shoulder section, said first semicircular shoulder portion over one half of the cover, to the first semicircular shoulder offset in the side closer to the fuel injection unit in the axial direction of the fuel injection valve for While composed of serial and second semicircular shoulders over the other half of the cover, the first and second semicircular shoulder between the upright standing wall so as to connect the front end of the fuel supply cap Includes a semicircular pressing surface that holds at least one of the first and second semicircular shoulders to prevent the fuel injection valve from being detached from the mounting hole, and stands on the rising wall from the pressing surface. The first semicircular shoulder portion is arranged to be offset from the axis of the fuel injection valve toward the coupler side so as to be continuous with the base end of the coupler. the first, characterized in that that. Incidentally, the pressing surface, that corresponds to the second semicircular end surface 28b in an embodiment of the present invention which will be described later.

The present invention, in addition to the first feature, the second feature in that the pressing surface Ru pressing said second semicircular shoulders.

The present invention, in addition to the first or second feature, the engine is a single cylinder engine, the holding member, a third feature in that it has a fuel joint for connecting the fuel conduit.

In the claims and the specification, the fuel injection part side in the axial direction of the electromagnetic fuel injection valve is referred to as “front”, and the fuel inlet part side is referred to as “rearward”. Therefore, one end of the electromagnetic fuel injection valve on the fuel injection portion side is the front end of the fuel injection valve, and the other end on the fuel inlet portion side is the rear end of the fuel injection valve.

  According to the first feature of the present invention, the positioning means includes an upright wall formed between the first and second semicircular shoulders formed on the synthetic resin cover of the fuel injection valve, and the fuel of the holding member. Since the rotation stopper surface formed at the front end of the supply cap is in contact with the supply cap, the direction of the coupler can be regulated in a certain direction without forming protrusions on the fuel injection valve and the fuel supply cap. In addition, since the respective semi-circular portions of the covering body and the fuel supply cap receive the rotational load applied to the positioning means, the strength of the positioning means can be effectively increased. Therefore, the fuel injection valve mounting structure can be made compact, and the appearance can be improved and the structure can be made strong.

According to a second aspect of the present invention, the rotation stopper surface, extended to maximize the contact area with the upright wall, Ru can further enhance the strength of the positioning means.

According to the third aspect of the present invention, it is possible to obtain a fuel injection valve mounting structure that is suitable for a single cylinder engine and has a good appearance and a compact size.

The top view which shows the state which attached the fuel injection valve to the engine with the attachment structure of this invention. FIG. 2 is a view taken in the direction of arrow 2 in FIG. 1. FIG. 3 is a sectional view taken along line 3-3 in FIG. 1. The perspective view which shows the principal part of the said fuel injection valve.

Embodiments of the present invention, described below with reference to a preferred embodiment of the present invention shown in the accompanying drawings.

  In FIG. 1, a mounting hole 2 is provided in one side wall downstream of a throttle valve (not shown) of a throttle body 1 of a single cylinder engine, and an outer end opening of the mounting hole 2 is formed in an annular recess 2a.

  On the other hand, an electromagnetic fuel injection valve (hereinafter simply referred to as a fuel injection valve) I attached to the throttle body 1 has a fuel injection portion 5 at the front end and a fuel inlet portion 6 at the rear end. A seal member 4 is attached to the outer periphery of the base of the injection part 5, and a seal member 8 is attached to a seal groove 7 formed on the outer periphery of the fuel inlet part 6.

  On the outer periphery of the fuel injection valve I, there is formed a synthetic resin covering 10 molded so as to embed the internal coil 9. The coupler 12 is integrally molded, and the coupler 12 accommodates and holds the energization terminal 13 connected to the coil 9. A front shoulder 15 facing the fuel injection portion 5 side and a rear shoulder 16 facing the fuel inlet portion 6 side are formed on the covering 10. The fuel injection portion 5 is fitted into the mounting hole 2 so that the seal member 4 is pushed into the annular recess 2a by the front shoulder 15 of the covering 10.

As shown in FIGS. 1, 3, and 4, the rear shoulder portion 16 includes a first semicircular shoulder portion 16 a extending over one half circumference of the covering body 10, and the first semicircular shoulder portion 16 a. A second semicircular shoulder 16b that extends axially forward (that is, on the side close to the fuel injection portion 5 in the axial direction of the fuel injection valve I) and extends over the other half circumference of the covering 10, and The first and second semicircular shoulder portions 16a and 16b are configured with an upstanding wall 16c that rises so as to be connected. At that time , the first semicircular shoulder 16a is arranged in the same phase as the coupler 12, that is, offset from the axis of the fuel injection valve I toward the coupler 12 so as to be connected to the base end of the coupler 12 .

  As shown in FIGS. 1 and 2, a synthetic resin holding member R is prepared to hold the fuel injection valve I having the fuel injection portion 5 fitted in the mounting hole 2 and to supply fuel to the fuel injection valve I. The The holding member R has a cylindrical fuel supply cap 20, a support arm 21 that protrudes from one side of the fuel supply cap 20, and a protrusion that protrudes from the other side of the fuel supply cap 20 to communicate with the inside. The support arm 21 includes a bolt 24 inserted into the bolt hole 23 and screwed into a screw hole 26 of a mounting boss 25 formed at a predetermined position of the throttle body 1. It is fixed to a predetermined portion of the throttle body 1. The fuel joint 22 is connected to a fuel conduit 30 that guides fuel discharged from a fuel pump (not shown).

  1, 3, and 4 again, the fuel supply cap 20 is fitted on the outer periphery of the fuel inlet 6 while the seal member 8 is in close contact with the inner periphery thereof. A tapered surface 27 that guides the fitting of the fuel inlet 6 is formed in the front opening.

  A front end of the fuel supply cap 20 extends over one half of the circumference thereof, a first semicircular end surface 28a, and projects forward from the first semicircular end surface 28a. And a second semicircular end surface 28b and a rotation stopper surface 28c erected so as to connect the first and second semicircular end surfaces 28a, 28b, and the first and second semicircles thereof. The fuel injection valve I is disposed such that the first and second semicircular shoulder portions 16a and 16b face the end surfaces 28a and 28b, and the upright wall 16c contacts the rotation stopper surface 28c. In this case, in the illustrated example, the second semicircular end surface 28b serves as a pressing surface that presses the second semicircular shoulder portion 16b and prevents the fuel injection valve I from being detached from the mounting hole 2.

  However, both the first and second semicircular end surfaces 28a and 28b can be used as pressing surfaces for the first and second semicircular shoulder portions 16a and 16b, but at least the second semicircular end surface 28b can be pressed. Being a surface is effective for maximizing the contact area of the rotation stopper surface 28c with the standing wall 16c.

  Thus, the rotation stopper surface 28c and the upright wall 16c constitute a positioning means 29 that abuts each other and regulates the direction of the coupler 12 of the fuel injection valve I in a certain direction.

  Next, the operation of this embodiment will be described.

  In attaching the fuel injection valve I to the throttle body 1, first, the fuel injection portion 5 of the fuel injection valve I is fitted into the attachment hole 2 of the throttle body 1, and the seal member 4 is sealed by the front shoulder 15 of the covering 10. Is pushed into the annular recess 2a to seal around the fuel injection portion 5.

Next, the first and second semicircular end surfaces 28a, 28b of the fuel supply cap 20 of the holding member R are opposed to the first and second semicircular shoulder portions 16a, 16b of the fuel injection valve I, and a rotation stopper is provided. When the surface 28c is brought into contact with the standing wall 16c and the fuel supply cap 20 is fitted deeply into the outer periphery of the fuel inlet portion 6 of the fuel injection valve I, the second semicircular end surface 28b becomes the second semicircular shoulder portion 16b. Will face each other with a contact or a minute gap. In this state, the fuel supply cap 20, that is, the holding member R and the fuel injection valve I are connected in the rotation direction via the rotation stopper surface 28c and the standing wall 16c that are in contact with each other, and in this state, the holding member R Is appropriately rotated so that the bolt hole 23 of the support arm 21 is aligned with the screw hole 26 of the throttle body 1, and the bolt 24 inserted into the bolt hole 23 is screwed and tightened to the screw hole 26.

  Thus, the second semicircular end surface 28b presses the second semicircular shoulder portion 16b to prevent the fuel injection valve I from being detached from the mounting hole 2, and the rotation stopper surface 28c abuts against the standing wall 16c. The rotation of the fuel injection valve I is prevented and the direction of the coupler 12 is restricted to a certain direction. Therefore, a power supply coupler (not shown) can be connected to the coupler 12 from a certain direction, and the connection work can be easily performed.

  Thus, the positioning means 29 includes the upright wall 16c that connects between the first and second semicircular shoulder portions 16a and 16b formed on the synthetic resin covering 10 of the fuel injection valve I, and the holding member R. Since the first and second semicircular end surfaces 28a and 28b formed at the front end of the fuel supply cap 20 are in contact with a rotation stopper surface 28c that stands up so as to connect, the fuel injection valve I and The direction of the coupler can be restricted to a certain direction without forming a protrusion on the fuel supply cap 20. In addition, since the respective half-circular portions of the covering 10 and the fuel supply cap 20 receive the load in the rotational direction applied to the positioning means 29, the strength of the positioning means 29 can be effectively increased. Therefore, the fuel injection valve mounting structure can be made compact, and the appearance can be improved and the structure can be made strong. In particular, according to the structure of this embodiment, it is possible to provide a fuel injection valve mounting structure that is suitable for a single cylinder engine and has a good appearance and is compact.

  Further, the second semicircular shoulder portion 16b is disposed in front of the first semicircular shoulder portion 16a, and the second semicircular shoulder portion 16b is pressed by the second semicircular end surface 28b. Therefore, the strength of the positioning means 29 can be further increased by maximizing the contact area of the rotation stopper surface 28c with the upright wall 16c.

  Further, since the first semicircular shoulder portion 16a is disposed close to the coupler 12 in the same phase, the coupler 12 and the fuel supply cap 20 can be disposed close to each other, and the mounting structure of the fuel injection valve can be further reduced in size. Can contribute.

  As mentioned above, although the Example of this invention was described, this invention is not limited to it, A various design change is possible in the range which does not deviate from the summary. For example, the mounting hole 2 can be provided in the intake pipe of the engine. The present invention can also be implemented for a multi-cylinder engine.

I ... Fuel injection valve R ... Holding member 2 ... Mounting hole 5 ... Fuel injection part 6 ... Fuel inlet part 10 ... Covering body 12 .... coupler 16 ... rear shoulder 16a ... first semicircular shoulder 16b ... second semicircular shoulder 16c ... standing wall 20 ... fuel supply cap 28b: Presser surface (second semicircular end surface)
29 ... Positioning means 30 ... Fuel conduit

Claims (3)

Fuel injection portion of the front end of the fuel injection valve (I) to (5) as well as fitted to the mounting hole of the engine (2), the outer circumference of the fuel inlet portion of the rear end of the fuel injection valve (I) (6), A fuel supply cap (20) provided on a holding member (R) fixed to the engine is fitted, and one side of the fuel injection valve (I) is disposed at an axially intermediate portion of the fuel injection valve (I). Write a coupler (12) which projects is provided, formed by setting only the positioning means (29) for regulating a constant direction orientation between the holding member (R) and a fuel injection valve (I) of this coupler (12), In the fuel injection valve mounting structure,
A synthetic resin covering (10) integrated with the coupler (12) having a rear shoulder (16) facing the fuel inlet (6) on the outer periphery of the axial intermediate portion of the fuel injection valve (I). )
The rear shoulder section (16), the covering body first semicircular shoulder portion over one half (10) and (16a), the fuel injection valve with respect to the first semi-circular shoulder (16a) ( second semicircular shoulders over the other half of the fuel injector in the axial direction (the covering body 5) offset in the side close (10) I) and (16b), the first and second semicircular And a standing wall (16c) that rises so as to connect between the shoulders (16a, 16b), and the first and second semicircular shoulders at the front end of the fuel supply cap (20) A semicircular pressing surface (28b) that presses at least one of (16a, 16b) to prevent the fuel injection valve (I) from being detached from the mounting hole (2), and stands up from the pressing surface (28b) It comes into contact with the upright wall (16c) to form a rotation stopper surface (28c) constituting the positioning means (29)
The first semicircular shoulder (16a) is arranged so as to be offset from the axis of the fuel injection valve (I) toward the coupler (12) so as to continue to the base end of the coupler (12). to, the attachment of the fuel injection valve structure. The fuel injection valve mounting structure according to claim 1,
Characterized in that the pressing surface (28b) is Ru pressing said second semicircular shoulder (16b), the mounting structure of the fuel injection valve. The fuel injection valve mounting structure according to claim 1 or 2 ,
The fuel injection valve mounting structure, wherein the engine is a single cylinder engine, and the holding member (R) has a fuel joint (22) for connecting a fuel conduit (30).

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